Gaya APA
Beall, J. et al (2004).
Abridge dewey decimal classification and relative index .
USA:
OCLC Online Computer Libray Center.
Gaya MLA
Beall, Julianme. et al.
"Abridge dewey decimal classification and relative index".
USA:
OCLC Online Computer Libray Center,
2004.
Text.